Surface decoration of carbon nanotubes and mechanical properties of cement/carbon nanotube composites
Surface decoration of carbon nanotubes and mechanical properties of cement/carbon nanotube composites
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DOI：
10.1680/adcr.2008.20.2.65
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发表时间：
2008-04-01
影响因子：
2
通讯作者：
Penttala, V.
中科院分区：
文献类型：
--
作者：
Cwirzen, A.;Habermehl-Cwirzen, K.;Penttala, V.
研究了表面修饰方法对多壁碳纳米管（MWCNTs）润湿性和水泥浆体力学性能的影响。结果表明，多壁碳纳米管在水中的稳定和均匀的分散体，可以通过使用表面功能化结合使用聚丙烯酸聚合物的装饰。掺入这些分散体的水泥浆试样显示出良好的可加工性，并且即使仅少量添加MWCNT（即水泥重量的0.045-0.15%），抗压强度也增加了近50%。这些结果表明官能化的MWCNT的OH基团和可能的水泥基质的C-S-H相之间存在化学键，这增强了应力的传递。研究的第二种方法包括用聚丙烯酸聚合物和阿拉伯树胶装饰MWCNTs。这些分散体似乎仅在约2小时内是均匀的，之后发生进行性沉降。发现用所有分散体生产的水泥浆体具有良好的和易性;唯一显著的差异是掺入阿拉伯树胶的水泥的水合较慢。水泥浆体的机械性能与聚丙烯酸类聚合物处理的多壁碳纳米管纳入不变。
The present study investigated the effects of the method of surface decoration on the wetability of multi-walled carbon nanotubes (MWCNTs) and the mechanical properties of the cement paste incorporating these dispersions. The results showed that stable and homogenous dispersions of MWCNTs in water can be obtained by using surface functionalisation combined with decoration using polyacrylic acid polymers. The cement paste specimens incorporating these dispersions revealed good workability and an increase in the compressive strength of nearly 50% even with only a small addition of the MWCNTs, namely 0.045-0.15% of the cement weight. These results indicate the existence of chemical bonds between the OH groups of the functionalised MWCNTs and probably the C-S-H phase of the cement matrix, which enhanced the transfer of stresses. A second method that was studied included decoration of MWCNTs with polyacrylic acid polymers and gum Arabic. These dispersions appeared to be homogeneous only for approximately 2 h after which a progressive sedimentation occurred. Good workability was found for the cement pastes produced with all of the dispersions; the only significant difference being the slower hydration of the cement incorporating gum Arabic. The mechanical properties of the cement pastes incorporating MWCNTs treated with polyacrylic polymers were unchanged.